Lighting base



FIG. 1 is a perspective view of a lighting base showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the drawings illustrates portions of the lighting base and forms no part of the claimed design. 

CLAIM I claim, the ornamental design for a lighting base, as shown and described. 